Factors affecting pelletization rate in double roller press granulators

Double roller press granulators are key equipment in organic fertilizer production. They work by forcing powdered material into shape between two counter-rotating rollers. The pelletization rate, a core measure of equipment performance, directly impacts production efficiency and product quality.

1.Material Properties

Particle Size Distribution: The ideal particle size range should be controlled between 80-200 mesh. Too many fine powders make compaction difficult, while too many coarse particles weaken pellet strength.

Material Moisture Content: The best moisture content is usually 8-12%. Too high causes material to stick to the rollers; too low results in insufficient forming pressure.

Therefore, material moisture must be strictly controlled. Ensure materials are mixed evenly, and add binders if needed.

2.Equipment Parameters

Roller Gap Adjustment: A gap that's too small increases energy use; a gap that's too large reduces forming pressure. Adjust the roller gap dynamically based on material properties.

Regularly check the roller fatigue of the double roller press granulator, clean built-up material from the dies promptly, and keep the lubrication system working properly.

3.Process Conditions

Compaction Pressure Control: Typical pressure ranges from 20-50 MPa. Insufficient pressure makes pellets loose; excessive pressure can damage the equipment.

Die Design Parameters: The open-hole ratio affects discharge efficiency; the die hole taper affects how easily pellets release; and surface finish relates to friction resistance.

Determine the best pressure through testing. Adjust rotation speed based on output. It's best to establish standardized operating procedures.

The pelletization rate in double roller press granulators results from multiple factors working together. Systematic optimization is needed across material properties, equipment parameters, and process conditions.